13.10 upgrade

[Gerhard Magnus]

I'm running the 64-bit Ubuntu 13.04 Desktop that I've augmented with 
software from distributions other than the default ones, although 
nothing has been compiled. This evening, much to my surprise, there was 
a big box message asking me if I wanted to upgrade to Ubuntu 13.10. (No 
one from Ubuntu had actually paid that much attention to me before. I 
said "ask me later.") In the past, I have always done clean installs, if 
only for the opportunities these offer me, as a busy user, to review 
what's actually going on with my system and to actually apply my backups 
on a wide scale. But this message makes me curious. How reliable is the 
Ubuntu upgrade? Do people actually use it? Is there something special 
about this one, other than the "nudge"?